Ars Technica: Medicine show: Crown Sterling demos 256-bit RSA key-cracking at private event.
https://arstechnica.com/information-technology/2019/09/medicine-show-crown-sterling-demos-256-bit-rsa-key-cracking-at-private-event/

Jim Bell's comment:.

Are they talking about a 256 bit key, or a 512 bit composite key ?